重慶郵電大學通信學院 重慶 400065

摘 要 低功耗設計是大部分手持嵌入式設備必須考慮的一點，也是評定整個系統性能的重要指標之一。在整個低功耗控制過程中，系統時鐘的選擇和控制直接影響到整個系統的低功耗性能。高速精準的計數時鐘雖然能夠保證睡眠時間的精確度，但同時也增加了系統的功耗。因此，在使用慢速計數時鐘的基礎上，對時鐘的精確度加以修正，將能有效地解決功耗與時間精度的矛盾。本文以一個睡眠周期為例，從低功耗睡眠到喚醒的角度來詳細說明整個過程中對睡眠時間精度的控制。

關鍵詞 低功耗；同步校準；DRX周期

TD-LTE mobile terminal low power state time precision control

Wang Jianghan

 Chongqing University of Posts and Telecommunication, Chongqing 400065, China

Abstract  Low-power design is most handheld embedded devices must be considered that the assessment of the whole system is an important indicator of performance. In the low-power design, selection and control of the system clock directly affects the whole system of low-power performance. Although high-speed accurate count of the clock to ensure the accuracy of sleep time, but also increases the system power consumption. Therefore, the use of a slow count of the clock based on the accuracy of the clock to be correct, we can effectively solve the contradiction between power and time accuracy.In this paper, a sleep cycle, for example, power-saving sleep to wake up from the perspective of the whole process of detailed control of the clock, and the entire process between the terminal and base station frame synchronization interrupt the process.

Key words  Low power consumption; Synchronous calibration; DRX cycle